I need to understand if the initial Dissolved oxygen levels in a water system will impact the rate at which microorganisms in that system will utilise the oxygen.
For example, given two identical systems with biological activated carbon (BAC) at the same temperature and same nutrient supply. If one is aerated and the other not aerated (i.e. varying the DO levels), will the two systems still have the same oxygen consumption rates?
Well,
In the aeration case, BOD concentration surely decreased with a long life of BAC.
Regards
You may want to check also this related RG discussion: https://www.researchgate.net/post/Can-oxygen-uptake-rate-OUR-be-greater-than-oxygen-transfer-rate-OTR
It is a question of supply and demand. If the initial DO level is small, only sufficient for endogenous respiration, then the consumption rate would be low (cell economy principle). But if the initial DO is sufficient for normal aerobic respiration, then the consumption rates are equal for both cases (R is not dependent of oxygen availability) but the DO level in the first case (aerated) will start to drop more slowly until the supply rate is balanced by the microbial demand, whereas the DO level in the second case (non-aerated) would drop in a linear fashion until the DO is completely depleted whereupon the system will turn septic i.e. anaerobic respiration will take over.
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